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2016 ; 16
(ä): 48
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Zinc induces epithelial to mesenchymal transition in human lung cancer H460 cells
via superoxide anion-dependent mechanism
#MMPMID27330411
Ninsontia C
; Phiboonchaiyanan PP
; Chanvorachote P
Cancer Cell Int
2016[]; 16
(ä): 48
PMID27330411
show ga
BACKGROUND: Epithelial to mesenchymal transition (EMT) has been shown to be a
crucial enhancing mechanism in the process of cancer metastasis, as it increases
cancer cell capabilities to migrate, invade and survive in circulating systems.
This study aimed to investigate the effect of essential element zinc on EMT
characteristics in lung cancer cells. METHODS: The effect of zinc on EMT was
evaluated by determining the EMT behaviors using migration, invasion and colony
formation assay. EMT markers were examined by western blot analysis. Reactive
oxygen species (ROS) were detected by specific fluorescence dyes and flow
cytometry. All results were analyzed by ANOVA, followed by individual comparisons
with post hoc test. RESULTS: The present study has revealed for the first time
that the zinc could induce EMT and related metastatic behaviors in lung cancer
cells. Results showed that treatment of the cells with zinc resulted in the
significant increase of EMT markers N-cadherin, vimentin, snail and slug and
decrease of E-cadherin proteins. Zinc-treated cells exhibited the
mesenchymal-like morphology and increased cancer cell motility with significant
increase of activated FAK, Rac1, and RhoA. Also, tumorigenic abilities of lung
cancer cells could be enhanced by zinc. Importantly, the underlying mechanism was
found to be caused by the ability of zinc to generate intracellular superoxide
anion. Zinc was shown to induce cellular superoxide anion generation and the
up-regulation of EMT markers and the induced cell migration and invasion in
zinc-treated cells could be attenuated by the treatment of MnTBAP, a specific
superoxide anion inhibitor. CONCLUSION: Knowledge gains from this study may
highlight the roles of this important element in the regulation of EMT and cancer
metastasis and fulfill the understanding in the area of cancer cell biology.